Chair



" (No Model.)

J. W. ,MODONOUGH.

CHAIR.

No. 481,582. Patented Aug. 30, 1892.

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UNITED STATES PATENT OFFICE.

JAMES W. MCDONOUGH, OF NEW YORK, N. Y., ASSIGNOR TO BLAGKMER BROS. & 00., OF CHICAGO, ILLINOIS.

CHAIR.

SPECIFICATION forming part of Letters Patent No. 481,582, dated August 30,1892.

Application filed August 5, 1889.

To all whom it may concern.-

Be it known thatI, JAMES W. MoDoNoUGH, a citizen of the United States, residing at New York, N. Y., have invented certain new and useful Improvements in Chairs, of which the following is a specification.

My invention relates to certain improvements in oscillating or tilting chairs having a stationary base and movable seat connected by springs; and its object is to provide a chair of this character with springs which will permit a long horizontal tilting movement with the least possible sinking or vertical movement.

In the accompanying drawings, Figure 1 is a side elevation of a chair provided with my improved springs, the dotted lines showing a secondary position thereof. Fig. 2 is a front elevation of the same. Fig. 3 is a side View of the spring separated from the chair, and Fig. t is a perspective view of the spring in another position.

In the drawings, A A is the top or moving part of the chair, including the seat, back, and arms, and B is the base. These parts may be of any desired forn1that is to say, in the form of any office-chair, parlor-rocker, sewing-chair, or any of the types or forms wherein a stationary base and a movable seat are employed.

O 0 represent the springs, which are flat straps of spring-steel or other good resilient material. These springs, as shown, are substantially S shape in form, having their upper portions flattened and attached to the chair-seat and their lower portions bent to a plane parallel to but inside of the upper portions and continued in an oblique direction to cross said upper portion, and the extremity is then attached to the base of the chair. By

Serial No. 319,851. (No model.)

this construction a hanging loop is formed, Whose width is at all points less than the height thereof, and this construction allows a long' backward and forward tilting movement without contact between the upper and lower portions of the spring by reason of the members being crossed to lie in parallel planes and also by the shape of the loop. This construction, while permitting this long easy tilting movement, secures suflicient rigidity in the vertical line of the loop to prevent any rising or sinking movement in the vertical plane of the loop. These springs therefore constitute the sole and only connection between the base and the seat of the chair, and their form is such that there is no contact between their parts, and consequently no disagreeable noises produced in the use of the chair. The spring is formed upon such curves that an even strain is exercised on all parts, and it isso close to the chair that the center of gravity is in a plane passing through the bottom of the loops or curves.

In an oscillating or tilting chair or like article of furniture, the combination, with a base and movable seat, of a pair of springs connecting the base and seat, said springs being substantially S shape in form and having their upper portions flattened and attached to the seat, and their lower portions bent to a plane parallel to but inside of the upper portion and attached to the base, whereby is provided a hanging loop, whose width is less than the height thereof, substantially as and for the purpose described.

JAMES W. MODONOUGH.

Witnesses:

FRANK L. EASTMAN, WM. '0. MAGILL. 

